What is information? From simple to complex - data -> information -> knowledge.

Findability is 'the quality of being locatable or navigatable'.Item level - to what degree is a particular object easy to discover or locate?System level - how well does the environment support navigation and retrieval?

Wayfinding requires: knowing where you are; knowing your destination; following the best route; being able to recognise your destination; being able to find your way back.

The next section was about how to make something findable:The "in your face" discovery principle - expose the item in places known to be frequented by the target audience. He showed an example of a classic irritating Australian TV ad, a Brisbane carpet store in this case. It's disruptive and annoying, but everyone knows it exists. [Sadly, it made me a little bit homesick for Franco Cozzo. 'Megalo megalo megalo' is also a perfect example of targeting a niche audience, in this case the Greek and Italian speakers of Melbourne.]

Good tests for the effectiveness of your relevance mechanism:Precision = number of relevant and retrieved documents divided by the total number retrieved.Recall = number of relevant and retrieved documents divided by the total number of relevant documents.

Relevance - need to identify the type of search:Sample search - small number of documents are sufficient (e.g. first page of Google results)Existence search - search for a specific documentExhaustive search - full set of relevant data is needed.Sample and existence searches require precision; exhaustive searches require recall.

Content organisation:Taxonomy - organisation through labelling [but it seems in this context there's no hierarchy, the taxon are flat tags].Ontology - taxonomy and inference rules.Folksonomy - a social dimension.